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We study the magnetocapacitance (MC) effect and magnetoelectric (ME) couplingin spin-flop driven antiferromagnet Co4Ta2O9. The magnetocapacitance data athigh magnetic fields are analyzed by phenomenological Ginzburg-landau theory offerroelectromagnets and it is found that change in dielectric constant isproportional to the square of magnetization. The saturation polarization andmagnetoelectric coupling are estimated to be 52microC/m2 and $\gamma$ = 1.4x10-3 (emu/g)-2 respectively at 6 Tesla. Electric polarization is achievedbelow Neel temperature only when the sample is cooled in the presence ofmagnetic field and it is established that the ground state is non-ferroelectricimplying that magnetic lattice does not lead to spontaneous symmetry breakingin Co4Ta2O9.

Nature of Magnetoelectric coupling in corundum antiferromagnet Co4Ta2O9